Add Playwright test

apps/app/playwright/21-basic-features-for-guest/sticky-for-guest.spec.ts

@@ -0,0 +1,14 @@
+import { test, expect } from '@playwright/test';
+
+
+test('Sub navigation sticky changes when scrolling down and up', async({ page }) => {
+  await page.goto('/Sandbox');
+
+  // Sticky
+  await page.evaluate(() => window.scrollTo(0, 250));
+  await expect(page.locator('.sticky-outer-wrapper').first()).toHaveClass(/active/);
+
+  // Not sticky
+  await page.evaluate(() => window.scrollTo(0, 0));
+  await expect(page.locator('.sticky-outer-wrapper').first()).not.toHaveClass(/active/);
+});